cannot install new os version

Hi and welcome to the Forum!

Have you disabled your firewall and virus protection?
Have a look here also
http://www.ipadforums.net/ipad-help/49411-ios-5-upgrade-troubleshooting.html#post339338

The IPad Forum is a community of members from all walks of life and from all over the world coming together to share our experiences and to help each other learn about this wonderful piece of technology the Ipad. There is a wealth of information already here in the many threads we have so doing some searches will answer most of the questions you have. If then you cannot find the answer you are seeking then by all means post your question. There are many friendly and informed members here only too willing to help you.

We also have our own App - It is a very simple app to navigate.
http://itunes.apple.com/us/app/discussion-forum-for-ipad/id412896524?mt=8
Reading the IPad manual is a great place to start so please download a copy of these.
http://www.support.apple.com/manuals/ipad/
A very informative thread from which you will learn many tips and shortcuts for the IPad.
http://www.ipadforums.net/ipad-general-discussions/21590-tips-tricks-those-us-who-dont-know.html
We have rules like any Community so please read these also
http://www.ipadforums.net/forum-rul...um-rules-everybody-please-read.html#post14697

Once again we welcome you here and are so pleased you have joined us!

Sent from my iPad using iPF